This guide resolves defects in the following categories: ?C editorial errors ?C technical errors@ such as omissions and inconsistencies ?C ambiguities In addition@ the Implementors' Guide may include explanatory text found necessary as a result of interpretation difficulties apparent from the defect reports. This Guide will not address proposed additions@ deletions@ or modifications to the Recommendations that are not strictly related to implementation difficulties in the above categories. Proposals for new features should be made through contributions to the ITU-T.